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<p>Based on a 2000m<sup>3</sup>-level blast furnace in a domestic steel plant, a mathematical model of the tuyere swirl zone was established based on gas–solid two-phase flow, radiation, component transport, and combustion theories. The combustion reaction process between the combustion-supporting components in the tuyere swirl zone and the coke-oven gas (COG) and top circulating gas (TCG) was simulated under different blast furnace blast conditions. On this basis, the influence of different reducing gases on the initial air flow distribution in the combustion and swirl area of tuyere and the influence of preheating of reducing gases on smelting under injection conditions are deeply studied, and the different smelting results are visually displayed by cross-section contour method. The results show that the density of COG is small, and the mixed gas after combustion reaction will produce upward swirl, which is more conducive to the expansion of the swirl area in the height direction, while the TCG combustion product will not produce swirl. Compared with the use of TCG as combustion reactant, the blast furnace injection of COG as reduction reaction gas is more conducive to the development of central gas flow. The flame length of blast furnace with COG injection is 0.12&#xa0;m longer than that of blast furnace with TCG injection. Gas preheating plays a crucial role in gas distribution and flame combustion patterns within the blast furnace. When utilizing COG and TCG as reducing reaction gases, preheating treatment can significantly enhance the penetration of the mixed fluid into the burden layer, increase the central fluid velocity, raise the maximum burning temperature in the tuyere swirl zone, extend the flame length in this region, advance the flame combustion position, and promote the volumetric expansion of the tuyere swirl zone. The effect of preheating on the blast furnace with COG injection is more significant. The maximum temperature is increased by 249℃, the flame length is extended by 75%, and the preheating of the circulating gas on the top of the furnace makes the combustion flame produce upward swirl, which is conducive to increasing the temperature field uniformity in the upper and lower parts of the blast furnace.</p>

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Numerical Simulation Study of the Effects of Injection of Reducing Gas on Raceway in Blast Furnace

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • Yingjiang Wu,
  • Ziyu Liu,
  • Quanfu Cai,
  • Yongbin Xu,
  • Shaofeng Zhou,
  • Peng Li,
  • Yan Jin,
  • Wei Wang

摘要

Based on a 2000m3-level blast furnace in a domestic steel plant, a mathematical model of the tuyere swirl zone was established based on gas–solid two-phase flow, radiation, component transport, and combustion theories. The combustion reaction process between the combustion-supporting components in the tuyere swirl zone and the coke-oven gas (COG) and top circulating gas (TCG) was simulated under different blast furnace blast conditions. On this basis, the influence of different reducing gases on the initial air flow distribution in the combustion and swirl area of tuyere and the influence of preheating of reducing gases on smelting under injection conditions are deeply studied, and the different smelting results are visually displayed by cross-section contour method. The results show that the density of COG is small, and the mixed gas after combustion reaction will produce upward swirl, which is more conducive to the expansion of the swirl area in the height direction, while the TCG combustion product will not produce swirl. Compared with the use of TCG as combustion reactant, the blast furnace injection of COG as reduction reaction gas is more conducive to the development of central gas flow. The flame length of blast furnace with COG injection is 0.12 m longer than that of blast furnace with TCG injection. Gas preheating plays a crucial role in gas distribution and flame combustion patterns within the blast furnace. When utilizing COG and TCG as reducing reaction gases, preheating treatment can significantly enhance the penetration of the mixed fluid into the burden layer, increase the central fluid velocity, raise the maximum burning temperature in the tuyere swirl zone, extend the flame length in this region, advance the flame combustion position, and promote the volumetric expansion of the tuyere swirl zone. The effect of preheating on the blast furnace with COG injection is more significant. The maximum temperature is increased by 249℃, the flame length is extended by 75%, and the preheating of the circulating gas on the top of the furnace makes the combustion flame produce upward swirl, which is conducive to increasing the temperature field uniformity in the upper and lower parts of the blast furnace.